VI Tester's "passIf.vi" returns error 42 on 64-bit LabVIEW

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I have a unit test whose test code executes fine in both 32-bit and 64-bit LV, but when I run the test in 64-bit, "passIf.vi" returns error 42 with no explanation. Again, the upstream test code executes fine with no error and the "pass" Boolean TRUE. Have you seen this kind of behavior before? Anything I can do to poke at it?